Law enforcement professionals will be visibly present at Niwot High School when classes resume on Monday, principal Dennis Daly notified parents on Saturday.

Daly wrote, however, that despite that presence, "Niwot's teachers and staff will be focused on education excellence and returning the building's learning environment to normal."

The St. Vrain Valley School District canceled Niwot High's Friday classes after a "hit list," reportedly containing 20 to 30 names, was found there on Thursday. That followed a discovery earlier last week of a bomb threat scrawled in a school bathroom.

Daly said in his Saturday letter to parents and guardians of Niwot students that trained professionals with bomb-sniffing bombs had swept the school "and found no indications of explosive materials or devices."

Daly also wrote that the Boulder County Sheriff's Office has gotten numerous tips that its detectives have been evaluating throughout the weekend, and that detectives "are speaking with persons of interest."

The Niwot principal said the school district "has suspended one student until a number of concerns related to the incident have been resolved," but he didn't give more specifics in his letter about what those concerns are or the reason for the suspension.

Sheriff's Cmdr. Rick Brough confirmed in a Saturday night telephone interview that officers "have talked to a lot of people" who might have information that could help in the investigation.

As far as possible suspects, though, Brough said that "I wouldn't say we've narrowed it down to any one person."

Daly wrote that "based on the information and recommendations we are receiving from law enforcement and the extensive security measures in place, Niwot High School is ready to move forward."

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